<p>This invention provides a planar heating element that can eliminate the complexity of the design and manufacturing process of a planar heating element. The planar heating element can stably improve thermal efficiency independently of the area of the heating element and can realize a reduction in power consumption. A net-like base material (110) is formed by weaving fiber materials (111, 112) of approximately #40 two ply yarn in longitudinal and lateral directions into a net form so that they are substantially perpendicular to each other. The spacing between mutually adjacent fiber materials (111, 112) in longitudinal and lateral directions is 5 mm to 100 mm. The planar heating element can realize a reduction in power consumption and has satisfactory light transmission. Further, the problems of local heat generation and local heating can be avoided by using a longitudinal electroconducting material (115).</p>
